Winslow allderdice



W. ALLDERDICE.

DIE.

N0. 329,801. Patented Nov. 3, 1885.

UNITED STATES PATENT OFFICE.

WVINSLOW ALLDERDIOE, OF AKRON, OHIO, ASSIGNOR TO THE AKRON IRON COMPANY,OF SAME PLAGE.

DIE.

SPECII'ICATION forming part of Letters Patent N0. 329,801, datedNovember 3, 1885.

Application filed J anuary 26, 1885.

T all whom it may concern:

Be it known that I, VVINSLOW ALLDERDIOE, aeitizen of the United States,residing at Akron, in the county 0f Summit and State of Ohio, haveinvented a new and useful Improvement in Dies for Drawing, Compressing,and Polishing Gold Metal Bars, 0f whieh the following is aspecification.

The prineipal features 0f 1ny invention cousist 0f the die being formedwith an opening through it, in part a tapering curve and in parttangential t0 such curve, and also the rear end being of a flaringf011n.

In the drawings forming a part 0f this speeification, Figure l is asection ofthe die and its holder. Fig. 2 is a side view of the die, andFig. 3 is a front view 0l' the same.

The die a 0 is formed With an opening, c, through which cold metal barsmay be drawn and thereby comprcssed and polished. The

' front part 0f opening c is flaring in substantially a parabolie curve,and the rear part 0f the opening is eylindrieal and tangential t0 thecurved part, exeept at the end, whieh is slightly flaring. In this formof opening c there is spaee l'or lubricating material in the front partaround the bar to be drawn, and the gradually-decreasing eontraetion 0fthe opening inward t0 the cylindrical part facilitates the operation 0fdrawing, compressing, and polishing the bar, as the contraction is leastwhere the force 0f compression is greatest. The flaring front part 0fopening 0 may be formed, if desired, in a different eurve from 5 aparabola, a-s an are of a eirele to which the cylindrical part 0f thedie is tangential. At the rear end of the die its opening c is flaring,t0 prevent breaking the die from the expansion 0f the metal bar whenreleased from 00m- 4.0 pression in drawing it through the die. Suchexpansion is slight, but 0f great force, and if the die at the rear endof its opening 0 is cy lindrieal the edges 01 eorner are liable t0 bebroken by the expansion 0f the bar 011 emerg- 5 ing from the opening c.

The die consists 0f the inner steel part, a, and an outer wrought-ironpart er jacket, 0. The diameter 0f steel part a is reduced at Serial N0.153 974. (N0 model.)

its rear end, fofn1ing a shonlder, s, and the wrought-iron jaeket 0 hasa redueed rear part, o, forming a shoulder, s, f0r a bearing againstdie-holder b. The jacket o is sweated on the steel partthat is, it isheated at 0r abouta red heat, then placed 0n the die and allowed toshrink there by eooling. The jaeket forms a permanent part of the die,which is made to fit closely in its holder b by driving it in thelatter, which is forrned t0 receive it.

Instead 0f the two parts a 0, the die may be formed of a single piece ofsteel.

I claim as my invention l. A die for drawing, compressing, and polishingeold metal bars, having an opening the front part of whieh is of acurved tapering form, and another part is formed with parallel sidestangential t0 the eurved part, substantially as described.

2. A die f0r drawing, eompressing, and polishing cold metal bare, ofsuch forn1 that the interseetion 0f a plane through the axis of thedie-opening with the side of the Opening will be in part a paraboliecurve and in part parallel With the axis of the opening and tangentialt0 said curve, substantially as described.

3. A die for drawing, eompressing, and polishing cold metal bare, formedWith an opening that is flaring at both ends, and has parallel sidesintermediate the flaring parts, substantially as described.

4. A die f0r drawing, cornpressing, and polishing cold metal bars,formed with an opening, c, having a flaring rear end, n, substantiallyas described.

5. The die a o, formed of the steel part a 85 and awrought-iron jaeket,o, shrunk thereon, substantially as deseribed.

6. The die a o, having a reduced rear end, forming a shoulderbearing, s,against the die-holder b, in combination with said holder, 0 formed toreeeive the die, substantially as described.

WINSLOW ALLDERDICE. \Vitnessesz FREDK. BISHOI, J. G. RAYMOND.

